We have had many customers use the Waterproof End Walls as a screen for their Jayco Penguin. 

They use them as a type of bed end fly - sliding them into the sail track groove. 

This way they can open their windows and get a breeze but still have privacy from nosy neighbors and keep the rain out. 

However, please be mindful that the Waterproof XD screens are lightweight screens made for short-term travel. We have had ours for five years and it is still going strong. We camp most school holidays. But we do not live in our caravan full time. They are not designed for permanent or long-term habitation. 

If you are planning to live in your van long term you would be better suited to a more robust style of bed fly made from vinyl or heavy-duty cotton canvas.